Device to avoid complementarity of encryption algorithm

摘要

The present invention provides for the performance of security algorithms, such as DES, which overcomes the weaknesses of complementarity provided by conventional performance. In the DES implementation, the cryptographic processor supplies DES to the data block. The DES processor includes a first input port for receiving a data block, a second input port for receiving an encryption key, and an output port for outputting a data block after encryption. Nonlinear functions that have no complementarity are supplied to at least one port. The nonlinear function can construct a lookup table that can be advantageously derived from the DES S-Box.